Capture-gated Spectroscopic Measurements of Monoenergetic Neutrons with a Composite Scintillation Detector

Jason Nattress, M. Mayer, A. Foster, A. Barhoumi Meddeb, C. Trivelpiece, Z. Ounaies, I. Jovanovic

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We report on the measurements of monoenergetic neutrons from DD and DT fusion reactions by use of the capture gating method in a heterogeneous plastic-glass composite scintillation detector. The cylindrical detector is 5.08 cm in diameter and 5.05 cm in height and was fabricated using 1-mm diameter Li-doped glass rods (GS20) and scintillating polyvinyl toluene (EJ-290). Different scintillation decay constants are used to identify energy depositions in two materials constituting the composite scintillator. Geant4 simulations of the neutron thermalization and capture process were conducted, finding a mean capture time of approximately 2.6 μs for both DD and DT neutrons. A capture gating time acceptance window based on simulation results was used to identify the neutron thermalization pulses. The total scintillation light yield produced in neutron thermalization was measured and found to show consistency on event-by-event basis despite the variety of neutron thermalization histories prior to capture. The ratio of light yields from thermalization of 14.1 MeV and 2.45 MeV neutrons in the EJ-290 scintillator was determined to be 14.6, and the light output from 2.45 MeV neutrons was also correlated to its electron equivalent, obtaining a value of 0.58 ± 0.05 MeVee.

Original languageEnglish (US)
Article number7454847
Pages (from-to)1227-1235
Number of pages9
JournalIEEE Transactions on Nuclear Science
Volume63
Issue number2
DOIs
StatePublished - Apr 2016

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

Cite this